{"id":2092,"date":"2020-10-12T16:51:07","date_gmt":"2020-10-12T14:51:07","guid":{"rendered":"https:\/\/albapcb.com\/?p=2092"},"modified":"2020-11-13T13:24:05","modified_gmt":"2020-11-13T12:24:05","slug":"pcb-via-filling","status":"publish","type":"post","link":"https:\/\/albapcb.com\/es\/pcb-via-filling\/","title":{"rendered":"PCB: choose the type of VIA FILLING according to your needs"},"content":{"rendered":"<p>When we talk about Via Filling in PCBs, we mean a filling process of vias holes using materials usually dielectric\/isolating (but not only) for the purpose of:<br \/>\n\u2022 Protect hole metallization<br \/>\n\u2022 Prevent the passage of liquid or gas through holes themselves<br \/>\n\u2022 Impede the way up of tin during wave soldering<br \/>\n\u2022 In case of conformal coating on one side of the board to avoid flows of resin on the opposite side<\/p>\n<p>Such sealing can be obtained using different procedures, in consequence of those results will be different too. Alba PCB Group proposes two possibilities:<\/p>\n<p>\u2022 <strong>PSR Via Fill<\/strong>: Vias sealing through extra solder resist application (with photographic definition) using a dedicated drawing of solder mask.<\/p>\n<p>\u2022 <strong>RESIN Via Fill<\/strong>: sealing obtained through specific epoxy resin application (with no photographic definition) considering whether or not an over-coverage of a metallic or of solder resist or of both of them is need.<\/p>\n<p><strong>Filling with solder resist (for drilled diameter lower or equal to 0,4mm)<br \/>\n<\/strong>The occlusion of the hole has been obtained through an additional printing of solder resist in correspondence of vias, using a specific stencil realized in a drilled aluminum plate. This technique can guarantee a suitable result for drilling of 0,4mm diameter and lower, but it is not suggested for bigger size holes, due to chemical &#8211; physical features of the employed material (LPI).<br \/>\nOver 0,4mm diameter, hole sealing is not guaranteed, since it may become receptacle of chemical compounds which can create some problems in phase of soldering and lost of reliability in the long term.<br \/>\nEven in holes with lower diameter, the usual loss of volume of the employed material during its polymerization, leads to the formation of solder resist material gaps\/voids\/cracks inside holes, which even though sealed, do not present a whole filling.<\/p>\n<p><strong>Filling with resin (for drilled diameter to 0,7mm)<br \/>\n<\/strong>The occlusion of the hole occurs through a specific process of resining with material one- or two- component, but of screen printing type (so without of direct photographic definition): the typology of the material and the adopted application process assures the complete fill of the hole and with it, its sealing.<\/p>\n<h3><span style=\"color: #000000;\"><a href=\"https:\/\/albapcb.com\/pdf-download\/\">&gt; Download .pdf file including all technical details on via filling &lt;<\/a><br \/>\n<\/span><\/h3>\n","protected":false},"excerpt":{"rendered":"<p>When we talk about Via Filling in PCBs, we mean a filling process of vias holes using materials usually dielectric\/isolating (but not only) for the purpose of: \u2022 Protect hole metallization \u2022 Prevent the passage of liquid or gas through holes themselves \u2022 Impede the way up of tin during wave soldering \u2022 In case [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2072,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2092","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - 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